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- Number of terms: 20560
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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
A crystal oscillator that is surrounded by a temperature regulated heater (oven) to maintain a stable frequency in spite of external temperature variations.
Industry:Software
Instruction that is used in an assembly language programme but is an instruction for the assembler. Pseudo-instructions have no direct correspondence to machine language.
Industry:Software
Settling time is the time it takes the output analogue signal of a DAC to attain the value of the input data signal. This time (usually measured in nanoseconds) is measured from the 50% point of full-scale transition to within ±1 LSB of the final value.
Industry:Software
A) An indication of all sources that are contributing to a switcher’s final output at any given time. b) A light which lights up to indicate that the associated push-button has been selected or to indicate that the associated input to the switcher is on-air. c) A relay closure to activate a remotely situated lamp, i.e., on top of a camera, to warn the production crew which camera is on-air. Most monitors have tally lights and common practise is to connect them to the switcher tally output so that the director can see which source is on-air.
Industry:Software
Oxide-coated plastic-based magnetic tape used for recording video and audio signals.
Industry:Software
That portion of the composite video signal which lies above the blanking level and contains the picture information.
Industry:Software
A) Qualitatively: Capacity for seeing distinctly fine details that have a very small angular separation.
b) Quantitatively: Any of a number of measures of spatial discrimination such as the reciprocal of the value of the angular separation in minutes of arc of two neighbouring objects (points or lines or other specified stimuli) which the observer can just perceive to be separate. c) In system design, the reference value for normal human visual limiting resolution is 30 cycles/degree, i.e., 60 TV lines per angular degree subtended at the viewing position. For systems of current interest, the maximum viewing distances for discrete vertical resolution of the number of lines presented are shown in the following table.
Limiting Resolution of Vertical Detail (1) TV Per Subtended Maximum Line Frame Vertical Viewing Total Active Angle Distance (1) (2) 525 485 8.08" 7.1h (3) = 5.3w (4) 625 575 9.58" 6.0h = 4.5w (4) 1125 1035 17.25" 3.3h = 1.9W (5) (1) No adjustment has been applied for possible interlace or Kell effects.
(2) Assumes a shadow mask, if present, is not limiting.
(3) h is vertical height of display.
(4) w is horizontal width of display for 4:3 aspect ratio.
(5) W is horizontal width of display for 16:9 aspect ratio.
Industry:Software
In MPEG-4, static background scenes. Sprites can have dimensions much larger than what will be seen in any single frame. A coordinate system is provided to position objects in relation to each other and the sprites. MPEG-4’s scene description capabilities are built on concepts used previously by the Internet community’s Virtual Reality modelling Language (VRML).
Industry:Software
A) Defines the amount of incident light that passes through a surface. Both ambient and diffuse light falling on a transparent polygon are transmitted through the polygon, but highlights are not. In paint systems, a similar property called “opacity” determines how opaque the paint loaded on the artist’s brush really is. b) Full-color mode makes it possible for a polygon to be translucent by assigning a transparency between 0% and 100% (0 = opaque, 100 = fully transparent). To implement transparency, we assume that a semi-transparent polygon covers only a fraction of each pixel which it covers. The final pixel’s value is a blend of the background and the polygon. Again, colour maps have too few colours to do this. c) A feature in Indeo Video interactive codec in which software emulates chroma keying, allowing foreground video objects to be composited dynamically over a different background, a bitmap or possibly even another video. See Chroma Key.
Industry:Software
Results when an arithmetic operation generates a quantity beyond the capacity of the register. An overflow status bit in the flag register is set if an operation causes an overflow.
Industry:Software
